import type { UserContent } from "ai";
import type { UnstampedMessageStreamEvent, MessageStreamEvent } from "#protocol/message.js";
import type { CancelTurnResult as ProtocolCancelTurnResult } from "#protocol/cancel-turn.js";
import type { RunMode } from "#shared/run-mode.js";
import type { RuntimeSubagentChildResult } from "#runtime/actions/types.js";
import type { InputRequest, InputResponse } from "#runtime/input/types.js";
import type { ChannelAdapter } from "#channel/adapter.js";
import type { AgentLimitsDefinition } from "#shared/agent-definition.js";
import type { JsonObject } from "#shared/json.js";
export type { ContextAccessor } from "#context/key.js";
export type { ChannelInstrumentationProjection } from "#channel/instrumentation.js";
import type { ChannelInstrumentationProjection } from "#channel/instrumentation.js";
export type RunSessionLimits = Pick<AgentLimitsDefinition, "maxInputTokensPerSession" | "maxOutputTokensPerSession">;
/** Identifies the session turn to cancel. */
export interface CancelTurnInput {
    readonly sessionId: string;
    /** Limits the request to the turn the caller observed. */
    readonly turnId?: string;
}
/** Result of requesting turn cancellation. Both statuses are successful. */
export type CancelTurnResult = ProtocolCancelTurnResult;
/** Result of queueing manual context compaction for a session. */
export type CompactSessionResult = {
    readonly status: "accepted";
    readonly sessionId: string;
} | {
    readonly status: "no_active_session";
};
/** Result of queueing a manual context clear for a session. */
export type ClearSessionResult = {
    readonly status: "accepted";
    readonly sessionId: string;
} | {
    readonly status: "no_active_session";
};
/**
 * Identifies one turn within a session.
 *
 * `id` is the stable, unique turn identifier. `sequence` is the turn's
 * zero-based position in the session's turn order (the first turn is `0`).
 */
export interface SessionTurn {
    readonly id: string;
    readonly sequence: number;
}
/**
 * Lineage metadata for the eve parent execution that delegated this session.
 *
 * `sessionId` and `turn` describe the **immediate** parent that dispatched
 * this child. `rootSessionId` denormalizes the top of the dispatch chain so
 * descendants identify the user-facing session without walking up
 * parent-by-parent. Always populated at dispatch: a first-level child sets it
 * to the top session's id (its immediate parent), and deeper descendants
 * inherit the same root.
 */
export interface SessionParent {
    /**
     * Parent runtime-action tool call id that created this child session.
     */
    readonly callId: string;
    readonly rootSessionId: string;
    readonly sessionId: string;
    readonly turn: SessionTurn;
}
/**
 * Serializable W3C span context identifying a parent's open trace window.
 * Structural rather than an OTel `SpanContext` so the channel surface stays
 * free of tracing dependencies.
 */
export interface SessionTraceContext {
    readonly spanId: string;
    readonly traceFlags: number;
    readonly traceId: string;
}
/**
 * Authenticated caller principal attached to a request.
 *
 * Route-level auth strategies (JWT, OIDC, HTTP Basic, etc.) produce this
 * and pass it to the runtime on {@link RunInput.auth} and
 * {@link DeliverInput.auth}.
 */
export interface SessionAuthContext {
    readonly attributes: Readonly<Record<string, string | readonly string[]>>;
    readonly authenticator: string;
    readonly issuer?: string;
    readonly principalId: string;
    readonly principalType: string;
    readonly subject?: string;
}
/**
 * Runtime-provided function that writes one event to the event stream.
 *
 * Backed by `getWritable()` in the workflow runtime. Not part of the adapter
 * interface: the runtime always writes events itself.
 */
export type EventEmitFn = (event: UnstampedMessageStreamEvent) => Promise<void>;
/** Framework-internal caller waiting for one delegated conversation turn. */
export interface TurnCaller {
    readonly callId: string;
    readonly subagentName: string;
    readonly replyTo: {
        readonly kind: "hook";
        readonly token: string;
    } | {
        readonly kind: "callback";
        readonly url: string;
    };
}
/**
 * Base deliver payload crossing the runtime boundary.
 *
 * The runtime reads {@link message} and {@link inputResponses} for delivery
 * coalescing. Adapters extend this interface with their own typed fields (e.g.
 * Slack adapters add `interaction`) and receive the extended type through the
 * generic payload on their `deliver` hook.
 *
 * `message` is a plain text string or an AI SDK `UserContent` array (mixing
 * `text`, `image`, and `file` parts), letting channels forward file
 * attachments and other multimodal input straight to the harness.
 */
export interface DeliverPayload {
    readonly inputResponses?: readonly InputResponse[];
    readonly message?: string | UserContent;
    readonly context?: readonly string[];
    readonly outputSchema?: JsonObject;
    readonly [key: string]: unknown;
}
/** One command accepted by a durable session inbox. */
export type SessionCommand = {
    readonly auth?: SessionAuthContext | null;
    readonly caller?: TurnCaller;
    readonly kind: "send";
    readonly payload: DeliverPayload;
    readonly requestId?: string;
} | {
    readonly kind: "cancel";
    readonly turnId?: string;
} | {
    readonly kind: "compact";
} | {
    readonly kind: "clear";
} | {
    readonly kind: "reset";
    readonly reason?: string;
};
export type SessionSendCommandResult = {
    readonly status: "accepted";
    readonly sessionId: string;
} | {
    readonly status: "session_not_active";
};
/** Result of terminally resetting a session. */
export type ResetSessionResult = {
    readonly status: "reset";
    readonly previousSessionId: string;
} | {
    readonly status: "no_active_session";
};
export type SessionCommandResult<TCommand extends SessionCommand = SessionCommand> = TCommand extends {
    readonly kind: "send";
} ? SessionSendCommandResult : TCommand extends {
    readonly kind: "cancel";
} ? CancelTurnResult : TCommand extends {
    readonly kind: "compact";
} ? CompactSessionResult : TCommand extends {
    readonly kind: "clear";
} ? ClearSessionResult : ResetSessionResult;
export interface DispatchContinuationInput<TCommand extends SessionCommand = SessionCommand> {
    readonly command: TCommand;
    readonly continuationToken: string;
}
export interface DispatchSessionInput<TCommand extends SessionCommand = SessionCommand> {
    readonly command: TCommand;
    readonly sessionId: string;
}
/**
 * Deliver payload sent through the workflow `resumeHook`.
 *
 * Wraps the raw {@link DeliverPayload} with optional auth and turn-caller
 * metadata so both cross the durable hook boundary outside adapter-owned data.
 */
export interface DeliverHookPayload {
    readonly auth?: SessionAuthContext | null;
    /** Delegated caller waiting for this turn's settled result. */
    readonly caller?: TurnCaller;
    /** Inbound channel request id used only for workflow attributes. */
    readonly requestId?: string;
    readonly kind: "deliver";
    readonly payloads: readonly DeliverPayload[];
}
/** Internal deadline signal sent through the stable session command inbox. */
export interface SessionTimeoutHookPayload {
    readonly kind: "session-timeout";
}
/** Requests a context compaction without delivering model input. */
export interface CompactSessionHookPayload {
    readonly kind: "compact";
}
/** Requests a context clear without delivering model input. */
export interface ClearSessionHookPayload {
    readonly kind: "clear";
}
/**
 * Child-produced subagent results resumed back into a parked parent workflow.
 *
 * The `runtime-action-result` discriminator predates this subagent-only inbox
 * lane. Parent-produced dispatch results never travel through this hook.
 */
export interface RuntimeActionResultHookPayload {
    readonly kind: "runtime-action-result";
    readonly results: readonly RuntimeSubagentChildResult[];
}
/**
 * Event coordinates attached to a proxied `input.requested` batch.
 *
 * Mirrors the `data` payload of the child's `input.requested` stream event so
 * the parent re-emits the same semantics without inventing new identifiers.
 */
export interface SubagentInputRequestEvent {
    readonly requests: readonly InputRequest[];
    readonly sequence: number;
    readonly stepIndex: number;
    readonly turnId: string;
}
/**
 * Proxy payload sent from a child subagent to its parent when the child parks
 * on a pending input batch.
 *
 * Runtime-internal. Channel adapters and authored code never observe this
 * kind: it exists only on the durable hook between the subagent adapter's
 * `input.requested` handler and the parent's runtime loop.
 */
export interface SubagentInputRequestHookPayload {
    readonly callId: string;
    readonly childContinuationToken: string;
    readonly childSessionId: string;
    readonly event: SubagentInputRequestEvent;
    readonly kind: "subagent-input-request";
    readonly subagentName: string;
}
/** Authorization lifecycle event forwarded from a delegated child. */
export type SubagentAuthorizationEvent = Extract<UnstampedMessageStreamEvent, {
    type: "authorization.required" | "authorization.completed";
}>;
/**
 * Proxy payload sent from a child subagent while it waits for authorization.
 *
 * Runtime-internal. The parent re-emits the unchanged event through its own
 * channel; the authorization callback continues to target the child directly.
 */
export interface SubagentAuthorizationEventHookPayload {
    readonly callId: string;
    readonly childSessionId: string;
    readonly event: SubagentAuthorizationEvent;
    readonly kind: "subagent-authorization-event";
    readonly subagentName: string;
}
/**
 * Serializable payload sent through the workflow `resumeHook`.
 */
export type HookPayload = ClearSessionHookPayload | CompactSessionHookPayload | DeliverHookPayload | RuntimeActionResultHookPayload | SessionTimeoutHookPayload | SubagentAuthorizationEventHookPayload | SubagentInputRequestHookPayload;
/**
 * Initial caller callback attached to a delegated session at creation.
 *
 * `url` is the absolute callback endpoint. `token` is the capability token
 * embedded in the framework-owned callback route. `callId` and `subagentName`
 * correlate the callee's result to the pending tool call. Task sessions send a
 * terminal session result. Conversation sessions use this as their first turn's
 * caller; each continuation supplies the caller for that turn.
 */
export interface SessionCallback {
    readonly callId: string;
    readonly subagentName: string;
    readonly token: string;
    readonly url: string;
}
/**
 * Runtime capabilities granted to one eve session.
 *
 * Capabilities describe what the session may do mid-turn: a session-level
 * contract, orthogonal to {@link RunInput.mode} which decides done-vs-park on
 * an empty turn.
 *
 * Channel routes that can reach a human (HTTP, Slack, etc.) set
 * `requestInput: true` when starting a run. Subagent dispatch inherits the
 * parent's capabilities pointwise, so HITL bubbles up transparently through a
 * conversation chain and stays disabled in a scheduled chain.
 */
export interface SessionCapabilities {
    /**
     * True when the session may request input from a human (tool approvals,
     * `ask_question`). The runtime reads this in every HITL gate:
     *
     * 1. `ask_question` tool registration in `buildToolSet`: the tool is hidden
     *    from the model when the session cannot request input.
     * 2. The pending-input park guard: scheduled task sessions without this flag
     *    fail fast rather than waiting for a response, covering both tool
     *    approvals and `ask_question` prompts the model has already emitted.
     */
    readonly requestInput?: boolean;
}
/**
 * Single input shape consumed by {@link Runtime.createSession} for both root runs
 * (started by routes) and delegated child runs (started by the
 * subagent tool wrapper).
 */
export interface RunInput {
    readonly adapter: ChannelAdapter<any>;
    /**
     * Registered channel name for root sessions started from an authored
     * channel route. Framework runs omit this and use their framework
     * adapter kind (`http`, `schedule`, `subagent`) directly.
     */
    readonly channelName?: string;
    readonly channelMetadata?: ChannelInstrumentationProjection;
    /**
     * Authenticated caller principal for this session. `null` means the
     * request was accepted with no credentials.
     */
    readonly auth: SessionAuthContext | null;
    /**
     * Session-level capabilities. When omitted, every flag is
     * interpreted as `false`. Channel routes that can reach a human
     * set `capabilities: { requestInput: true }`; scheduled task routes
     * leave this undefined.
     */
    readonly capabilities?: SessionCapabilities;
    /** Inbound channel request id used to correlate workflow attributes. */
    readonly requestId?: string;
    /**
     * Human-readable workflow title for top-level sessions. When omitted, the
     * runtime derives `$eve.title` from {@link input.message}.
     */
    readonly title?: string;
    /**
     * Optional caller callback. Task sessions post when the session completes or
     * fails. Conversation sessions use it for the first turn; continuations carry
     * the caller for their own turn.
     */
    readonly callback?: SessionCallback;
    /**
     * Session continuation token for delivery and hook creation. Channels can
     * re-key the session during the first turn via
     * `ctx.session.continuation.rekey(...)` (e.g. Slack adopts its first
     * post's `ts` as the thread root), so an initial placeholder token is
     * acceptable when full identity isn't known until the first message. ID-only
     * transports omit this field.
     */
    readonly continuationToken?: string;
    /**
     * The original (top-level) caller's auth, forwarded down the delegation
     * chain so the child's `session.auth.initiator` always resolves back to
     * whoever started the root session. Defaults to {@link auth} when omitted
     * (root session behavior).
     */
    readonly initiatorAuth?: SessionAuthContext | null;
    readonly input: {
        readonly message: string | UserContent;
        readonly context?: readonly string[];
        readonly outputSchema?: JsonObject;
    };
    readonly mode: RunMode;
    readonly parent?: SessionParent;
    /**
     * Dispatching parent's open trace window. Handed down rather than looked up
     * because trace state is scoped to one session's context.
     */
    readonly parentTraceContext?: SessionTraceContext;
    /**
     * Runtime-supplied session limits. Delegated local subagents use this to
     * carry the parent's remaining quota and delegation caps with the same limit
     * fields authors configure on agents; `false` means no inherited token cap
     * for that axis.
     */
    readonly limits?: RunSessionLimits;
    /**
     * Framework-owned depth of delegated local subagent sessions. Root sessions
     * omit this and are treated as depth 0; each local child receives
     * parent depth + 1.
     */
    readonly subagentDepth?: number;
}
export interface DeliverInput {
    /**
     * Authenticated principal for this follow-up message.
     * May differ from the session initiator when different users send
     * messages to the same session. The runtime updates `AuthKey` from
     * this field before calling the adapter's hooks.
     */
    readonly auth?: SessionAuthContext | null;
    /** Delegated caller waiting for this turn's settled result. */
    readonly caller?: TurnCaller;
    /** Inbound channel request id used to correlate workflow attributes. */
    readonly requestId?: string;
    readonly continuationToken: string;
    readonly payload: DeliverPayload;
}
/**
 * Terminal outcome of a runtime run.
 *
 * The durable event stream's `session.completed` / `session.failed`
 * events report terminal state on the workflow runtime.
 */
export type RunResult = {
    readonly status: "completed";
    readonly output: string;
} | {
    readonly status: "waiting";
};
/**
 * Handle returned by `runtime.createSession()` once the command inbox is ready,
 * before the step loop completes.
 *
 * Carries the identifiers needed for stream endpoints.
 */
export interface RunHandle {
    readonly events: ReadableStream<MessageStreamEvent>;
    /**
     * Runtime-owned identifier for this session. Stream and inspection APIs
     * key on it: workflow-backed runs expose the workflow run id.
     */
    readonly sessionId: string;
}
/**
 * Runtime interface consumed by routes and the subagent tool wrapper.
 */
export interface Runtime {
    /**
     * Starts a new run from a flat platform-shape input.
     *
     * Loads the compiled bundle (using the node id baked in at construction
     * time), builds the seeded {@link AlsContext}, and drives the step loop to
     * completion.
     */
    createSession(input: RunInput): Promise<RunHandle>;
    dispatchContinuation<TCommand extends SessionCommand>(input: DispatchContinuationInput<TCommand>): Promise<SessionCommandResult<TCommand>>;
    dispatchSession<TCommand extends SessionCommand>(input: DispatchSessionInput<TCommand>): Promise<SessionCommandResult<TCommand>>;
    /**
     * Resolves the session that currently owns a continuation token without
     * delivering input or starting a run. Returns `undefined` when no session
     * owns the token.
     */
    resolveContinuation(continuationToken: string): Promise<{
        sessionId: string;
    } | undefined>;
    /**
     * Returns a readable stream of lifecycle events for an existing session.
     *
     * Called by the framework's HTTP session-stream route and any user-authored
     * event-streaming route. Backed by the workflow API's per-session durable
     * stream.
     *
     * Nonnegative `options.startIndex` values are the zero-based position of the
     * first event to yield. Negative values read relative to the current tail.
     * The framework HTTP session-stream route forwards the `startIndex` query
     * parameter unchanged.
     */
    getEventStream(sessionId: string, options?: GetEventStreamOptions): Promise<ReadableStream<MessageStreamEvent>>;
    /**
     * Resolves the durable tail of a session's event stream: the zero-based
     * index of the last recorded event, or `-1` before the first. Callers use
     * it to bound a read at the tail they observed instead of following the
     * live stream.
     */
    getStreamTailIndex(sessionId: string): Promise<number>;
}
/**
 * Options accepted by {@link Runtime.getEventStream}.
 */
export interface GetEventStreamOptions {
    /**
     * Zero-based index of the first event to emit. Negative values read from
     * the current tail (`-1` starts at the latest event). Defaults to `0`
     * (replay the entire stream).
     */
    readonly startIndex?: number;
}